9-2.1x=-(x+0.9)

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Solution for 9-2.1x=-(x+0.9) equation: 



9-2.1x=-(x+0.9)

We move all terms to the left:

9-2.1x-(-(x+0.9))=0



We calculate terms in parentheses: -(-(x+0.9)), so:

-(x+0.9)

We get rid of parentheses

-x-0.9

We add all the numbers together, and all the variables

-1x-0.9

Back to the equation:

-(-1x-0.9)



We get rid of parentheses

-2.1x+1x+0.9+9=0

We add all the numbers together, and all the variables

-1.1x+9.9=0

We move all terms containing x to the left, all other terms to the right

-1.1x=-9.9

x=-9.9/-1.1

x=+9

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